Cookie tin heaters. One inside, and one out. The outside one I used block to make wind break and support the waterer. And no freezing....execpt when bulb burns out. But on my second year with them, and only on 2 bulbs.
GwenDellAnno---I understand your heater, but what does the 5 gallon jug dump into?? Any pics of "dispenser" portion that is sitting on heater??? I'm assuming it is a gravity system?
Thanks
TNT